Multi-scale numerical analysis for the failure modes of pin-load composite laminate

To give full play to the mechanical potentiality of the pin-loaded composite laminate, the macro-mesoscopic multi-scale numerical method is developed to predict accurately the failure load of the structure, to simulate partial damage initiation, expansion and to guide the structure design. The improved unit cell model(GMC) is implanted to the numerical model by the user subroutines (USDFLD) provided by ABAQUS. The macro-micro multi-scale numerical model considering the damage/failure of micro-constituent materials is created for the pin-loaded composite laminate based on the general finite element software ABAQUS. The failure modes and the extruding strength of the pin-loaded laminate structure under the double-shear loading are simulated and predicted. By comparing the simulated failure modes with the test results in the literature, and compare the limited load with the experimental results, the feasibility of model is verified. The effect of specimen geometry dimension on the failure mode and the limited extruding strength of pin-loaded laminate structure are analyzed. The change of the width-diameter ratio will affect the failure mode, the extruding strength of the pin-loaded composite laminate and especially for the extruding strength.